Theopiiil joseph mateju



Nov. 23 1926. I 1,608,411

T. J. MATEJU PERPETUAL CALENDAR Filed Jan. 30, 1924 2 Sheets-Sheet 1 mdag 1 ,3, d il (F 1 g unda y L WITNESSES INVENTQR,

/ .JZeophiL J. Mazz ATTORNEYS.

.Nov. 23 1926;.

T. J. MATEJU PERPETUAL CALENDAR Filed Jan. 50,1924

2 Sheets-Sheet 2 lNVEN TOR Theo viii J WITNESES. I

BY f6 ATTORNEYS.

Patented Nov. 23, 1926.

UNITED STATES rrica.

PERPETUAL CALENDAR.

Application filed January 30. 1924. Serial No. 689.453.

This invention has relation to calendars and has particular reference to an apparatus and system for facilitating the defining of the day of the week upon which a given date falls.

The main object of the present invent-ion resides in the provision of an extremely simple and condensed set oftables or charts and a system of employing the same, by means of which the day of the week upon which a given date falls may be rapidlyand accurately ascertained where the present and almost universally accepted calendar known as the Gregorian calendar is used.

As a-further object the invention contemplates a table and system of the character set forth which is readily comprehensible and workable by the layman and which is highly efficient and thoroughly reliable for the purpose specified.

' With the above recited and other objects in view, the invention resides in the novel tabulation and arrangement of the tables, which will be hereinafter fully described in 25 the following specification, illustrated in the accompanying drawings and particularly pointed out in the appended claims, it being understood that the right is reserved to embodiments other than those actually illustrated and used to the full extent indicated by the general meaning in which the claims are expressed and by variations in the phraseology thereof.

In the drawings Figures 1 and 2 illustrate charts or tables employed constituting the apparatus by means of which the invention is carried into practice.

Fig. 3 is a key chart for use in connection therewith.

Fig. 4 is a view of a chartconstituting a modified adaptation of the invention which is used for a single century.

Referring to the drawings by characters of reference, A designates a chart which includes a series of vertical columns a, b, 0 and (Z, the column a comprising a vertically spaced series of numerals from 00 to 28, the column Z) comprising a vertically spacedseries of numerals from 29 to 56 andarranged with the uppermost numeral 29 in horizontal alignment with the numeral 01 of the column a, the column 0 comprising a series of vertically spaced numerals 57 to 84 in horizontal alignment with the numerals of the columns Z) and the column d comprisinga vertically spacedseries of numerals from 85 to 99, with the numerals thereof in horizontal alignment with the numerals of the preceding column 0. Thenumerals which read from 00 to 99 serve to constitute the years within any given century. The leap year numerals or the numerals which are equally divisible by four are of a distinguishing character or color to indicate the leap years. The horizontal rows of mimerals in the columns a, b. c and 03, except the leap year rows, are distinguished by designating indicia e such as the Roman numerals I, II and III. The chart further includes a plurality of vertical columns f, g, and h which include the numerals O, 1, 2, 3, 4, 5 and 6. the said numerals in said column which fall opposite the horizontal leap year rows also being of a distinguishing character or color with respect to the remaining numerals of said columns and corresponding to the color or character of the numerals in the columns a, Z), 0 and d. The columns g and h are respectively headed by distinguishing 'indicia. 2'. such as the R0- man numerals I, II and III which correspond to the designating indicia e. chart further includes a vertical column j including numerals 0, 1, 2, 3, l, 5 and 6 and said latter column j is employed in connection with the leap centuries only and may cooperate either with the rows or columns a, 5, 0 and (Z or an additional simi ar or rows of columns indicated at a, b,c and d, The chart B illustrated in Fig. 2 comprises a plurality of vertical columnsk, Z, m 40., 0, p, q, r. s, t, a and o, in which columns the numerals 0. 1, 2, 3. 4, 5 and 6 appear said columns being headed respectively by the names of the months of the year. Each transverse row is of a distinguishing character or color, each one being designated by a similarly colored or characterized indicium w or 1 key chart (3 is 3 in The ice

which a vertical column as containing the names of the days of the week is arranged and a vertical column a alongside thereof having numerical equivalents for the days of the week.

The system or method operates in the following manner; first, the particular year of the given date is found on the chart A which sets forth in either of the columns f, g, 72, or

the particular horizontal row to or jwhich is to be used in the chart B. One of the ver tieal columns to a is then selected which contains the month of the date and the numbcr appearing in the intersecting row and column of the chart B is then added to the number of the date. The sum total is then divided by seven and the remainder will give the numerical equivalent of the day of the week upon which the date fell.

For example, in order to find the day of the week upon which August 3,1921 fell, the century number 19 is'iirst found in column a of chart A, the distinguishing character of which is the Roman numeral Ill; thereby indicating that column 72 having the Roman numeral III is to be used. The next step is to find the number in column h which is to be employed and this is accomplished by finding the year of the century which is 21 in this instance. The horizontal row in which 21 is found indicates that the numher 5 in column h is in the samehOrizontal row with the year number 21. As the year 1921 was not a leap year and did not occur in aleap century, the solid numeral 5 indicates the horizontal row to be used in chart B. T is next step is to select the vertical column in the chart B which comes under the heading August. This is found in column rwhich sets forth the fact that the numeral 0 is to'be added to the number of the date 3. Where the date is less than seven the sum of the number of the date and the number found on the chart B will immediately give the numerical equivalent of the day of the week as indicated on the key chart C which is found to be lVednesday.

In order to illustrate the problem in which the date combined with the numeral found is more than seven the following example is given. In this instance we will assume that the day of the week to be found fell on August 24:, 1.922. lVe again find that the century number 19 occurs in column a V opposite the indicating indicium which isv Roman numeral'lll. Column it which is August in vertical column 7' the numeral 1 appears which added to the number of the date 2 1 gives a total of 25. The sum total of these two numbers being more than seven is divided by seven and the remainder is found to be 4, which by referring to the key chart C is the numerical equivalent for Thursday. r

The following example is given to illustrate theuse of the device for finding the day of the week upon which a date in a leap, year is found. For instance August 31, 192%. Again consulting the chart A it is found that the century number 19 indicates that the vertical column h under the Roman numeral III is to be used and by projecting horizontally across the chart A in line with the year number 24 we find the outlined numeral 1 which indicates that horizontal outlined numeral 1 in chart/B is to be used. Under the heading August we find the numeral a in this row and by adding thereto the date number 31 we get the sum 35 which is equally divided by seven, leaving 0 as a remainder, which, by reference to the key chart C is the numerical equivalent for Sunday. A leap century is any century number divisible by four and in order to illustrate the use of the system and charts for ascertaining the day of the week upon which a given date in a leap century falls, we will use for example March 31, 2018, by consulting the chart A we find the year number 13 in the leap century 2013 in vertical column a and in horizontal alignment with the solid numeral 1 in row 7', This indicates that the solid horizontal row indicated by the solid numeral 1 in chart B is to be used. Under the vertical column March we find the numeral 4 which added to thenumber of the date 31 gives a sum total of 35 which is equally divisible by seven leaving the remainder 0. By referring to the key chart C it is found that 0 is the numerical equivalent for Sun? day.

In the modified adaptation of the invention illustrated in Fig. 1 the calendar chart I) is disclosed which is capable of use for one century only and said chart I) includes a plurality of vertical columns 10 and horizontal rows 11 in which the years of the century starting with 1 and ending with 2001 are systematically arranged. The leap year numbers 12 are of a distinguishing character orcolor, here indicated as outlined as distinguished, from the solid year numbers. A subdivision E of the chartl) comprises a plurality of vertical columns 13 and alternate horizontal rows 1 1 and 15 of a distinguishing character or color, in which columns and rows the numerals 0, 1, 2, 8, 4;, 5 and 6 are schematically arranged. The columns 13 are headed by the names of the months of the year indicated at 16. The

said chart D is used in connection with a key chart similar to that illustrated in Fig. 8 for indicating the numerical equivalents of the days of the week. In use of this chart, for example if it is desired to find on what day of the week October 13, 192d, falls, We first locate 2% which is found in one or" the horizontal rows 11 and vertical columns 10 in horizontal alignment with one of the rows 15 of the subdivision chart E. In the vertical column 13 of the subdivision chart E under the heading October we find the numeral 2 which added to the date 13 gives the sum total of 15. 15 is divisible by seven twice with a remainder of 1 which indicates that the day of the week upon which the selected date fell is Monda I claim:

l. A plurality of correlated charts constituting means for ascertaining the days of the week upon which a given date falls, compri ing a year chart having vertical columns and horizontal rows of numerals therein,

- designating indicia for certain of said rows,

the remaining rows of numerals being of a distinguishing character, a plurality of vertical columns and horizontal rows of numerals alongside the first-mentioned columns and rows, designating indicia for said columns corresponding to the designating indicia for the first-mentioned rows of numerals, a second chart having a plurality of vertical columns and horizontal rows of numerals, the alternate rows being of a dis tinguishing character, indicia representing the names of the months over said columns, and distinguishing characters corresponding to the first-mentioned distinguishing characters alongside the rows of numerals of the second chart, in combination with a key chart for indicating the numerical equivalents otthe days of the week.

2. A plurality of correlated charts constituting means for ascertaining the day of the week upon which a given date falls, comprising a year chart having thereon a plurality of vertical columns of numerals arranged in side-by-side relation and ranging from 00 to 99, the numerals of the several columns being disposed in horizontal.

rows, designating indicia for certain of said rows, the remaining rows being of a distinguishing character, a plurality of vertical columns of numerals ranging from 0 to 6 alongside the first-mentioned columns and presenting horizontal rows of numerals, certain of which rows are of a distinguishing character, designating indicia heading said latter columns and corresponding to the designating indicia of the vertical rows of the first-mentioned rows, a month chart having a plurality of vertical columns and horizontal rows of numerals, the alternate rows being of a distinguishing character, indicia representing the namesof the months over said columns, and distinguishing numerical characters corresponding to the numerical characters in the second-mentioned columns of the year chart, said latter characters arranged alongside the rows of numerals of the month chart, in combination with a key chart for indicating the numerical equivalents of the daysof the week,

3. A plurality of correlated charts, constituting means for ascertaining the day of the week upon which a given date falls, comprising a year chart having thereon a plurality of vertical columns of numerals arranged in side-by-side relation and ranging from 00 to 99, the numerals of the several columns being disposed in horizontal rows, designating indicia for certain of said rows, the remaining rows being of a distinguishing character, a plurality of vertical columns of numerals ranging from 0 to 6 alongside the first-mentioned columns and presenting horizontal rows of numerals, certain of which rows are of a distinguishing character, designating indicia heading said latter columns and corresponding to the designating indicia of the vertical rows of the first-mentioned rows for obtaining a number, a month chart having a plurality of vertical columns and horizontal rows of numerals, the alternate rows being of a distinguishing character, indicia representing the names of the months over said columns, and distinguishing numeral characters corresponding to the numerical characters in the second-mentioned columns of the year chart, said latter characters arranged alongside the rows of numerals of the month chart for obtaining the selected number from the month chart in correspondence with the year and month'ot the date selected; in combination with a key chart for indicating the numerical equivalents of the days of the week, whereby upon adding the date number selected to the number obtained from the month chart, the same if less than seven indicates the numerical equivalent of the day of the week in correspondence with the key chart, and whereby if said sum is seven or more than seven, division of the same by'seven causes the re mainder to indicate the numerical equivalent of the week in correspondence with the key chart.

4:. A plurality of correlated charts consti tuting an apparatus for ascertaining the day of the week upon which a given date falls, comprising a chart having vertical columns and horizontal rows of numerals, designating indicia for certain of said rows, the remaining row-s being of a distinguishing character, a vertical column of distinguishing characters for the leap centuries, vertical columns of distinguishing characters for the leap centuries, a second chart having a plurality of Vertical columns and horizontal rows of numerals, the alternate rows being of a distinguishing character, indicia representing the names of the months over said columns, and distinguishing characters corresponding to the first-mentioned distinguishing characters alongside of the rows of numerals of the second chart, in combination with a key chart for. indicating the THEOPHIL JOSEPH MATE-T U. 

